istereo2: 81d35769f546 src/istereo.c

istereo2

view src/istereo.c @ 2:81d35769f546

added the tunnel effect source

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 19 Sep 2015 05:51:51 +0300
parents
children	d4fed8aac9a6

line source

1 /*

2 Stereoscopic tunnel for iOS.

5 This program is free software: you can redistribute it and/or modify

6 it under the terms of the GNU General Public License as published by

7 the Free Software Foundation, either version 3 of the License, or

8 (at your option) any later version.

10 This program is distributed in the hope that it will be useful,

11 but WITHOUT ANY WARRANTY; without even the implied warranty of

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 GNU General Public License for more details.

15 You should have received a copy of the GNU General Public License

16 along with this program. If not, see <http://www.gnu.org/licenses/>.

17 */

20 #include <stdio.h>

21 #include <math.h>

22 #include <assert.h>

23 #include <unistd.h>

24 #include "opengl.h"

25 #include "istereo.h"

26 #include "sanegl.h"

27 #include "sdr.h"

28 #include "respath.h"

29 #include "tex.h"

30 #include "cam.h"

31 #include "vmath.h"

32 #include "config.h"

34 static void render(float t);

35 static void draw_tunnel(float t);

36 static void tunnel_vertex(float u, float v, float du, float dv, int tang_loc, float t);

37 static vec3_t calc_text_pos(float sec);

38 static void draw_text(float idx, vec3_t tpos, float alpha);

39 static void worm(float t, float z, float *tx, float *ty);

40 static unsigned int get_shader_program(const char *vfile, const char *pfile);

41 static float get_sec(void);

43 unsigned int prog, prog_simple, prog_tunnel, prog_text;

44 unsigned int tex, tex_stones, tex_normal, tex_text;

46 int view_xsz, view_ysz;

48 int stereo = 0;

49 int use_bump = 0;

51 /* construction parameters */

52 int sides = 24;

53 int segm = 20;

54 float tunnel_speed = 0.75;

55 float ring_height = 0.5;

56 float text_period = 13.0;

57 float text_speed = 2.2;

59 float split = 0.5275;

61 int init(void)

62 {

63 add_resource_path("sdr");

64 add_resource_path("data");

66 if(!(prog_simple = get_shader_program("test.v.glsl", "test.p.glsl"))) {

67 return -1;

68 }

69 if(!(prog_tunnel = get_shader_program("tunnel.v.glsl", "tunnel.p.glsl"))) {

70 return -1;

71 }

72 if(!(prog_text = get_shader_program("text.v.glsl", "text.p.glsl"))) {

73 return -1;

74 }

76 if(!(tex = load_texture(find_resource("tiles.jpg", 0, 0)))) {

77 return -1;

78 }

79 if(!(tex_stones = load_texture(find_resource("stonewall.jpg", 0, 0)))) {

80 return -1;

81 }

82 if(!(tex_normal = load_texture(find_resource("stonewall_normal.jpg", 0, 0)))) {

83 return -1;

84 }

85 if(!(tex_text = load_texture(find_resource("text.png", 0, 0)))) {

86 return -1;

87 }

89 glEnable(GL_DEPTH_TEST);

90 glEnable(GL_CULL_FACE);

92 cam_fov(42.5);

93 cam_clip(0.5, 250.0);

95 return 0;

96 }

98 void cleanup(void)

99 {

100 free_program(prog);

101 }

102

103 void redraw(void)

104 {

105 float pan_x, pan_y, z;

106 float tsec = get_sec();

107

108 z = ring_height * segm;

109 worm(tsec, z, &pan_x, &pan_y);

110

111 if(use_bump) {

112 glClearColor(0.01, 0.01, 0.01, 1.0);

113 tunnel_speed = 0.5;

114 } else {

115 glClearColor(0.6, 0.6, 0.6, 1.0);

116 tunnel_speed = 0.75;

117 }

118 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

119

120 if(stereo) {

121 int split_pt = (int)((float)view_ysz * split);

122

123 /* right eye */

124 glViewport(0, 0, view_xsz, split_pt);

125 cam_aspect((float)split_pt / (float)view_xsz);

126

127 gl_matrix_mode(GL_PROJECTION);

128 gl_load_identity();

129 cam_stereo_proj_matrix(CAM_RIGHT);

130 gl_rotatef(-90, 0, 0, 1);

131

132 gl_matrix_mode(GL_MODELVIEW);

133 gl_load_identity();

134 cam_stereo_view_matrix(CAM_RIGHT);

135 gl_translatef(-pan_x, -pan_y, -1.1 * ring_height * segm);

136

137 render(tsec);

138

139 /* left eye */

140 glViewport(0, split_pt, view_xsz, view_ysz - split_pt);

141 cam_aspect((float)(view_ysz - split_pt) / (float)view_xsz);

142

143 gl_matrix_mode(GL_PROJECTION);

144 gl_load_identity();

145 cam_stereo_proj_matrix(CAM_LEFT);

146 gl_rotatef(-90, 0, 0, 1);

147

148 gl_matrix_mode(GL_MODELVIEW);

149 gl_load_identity();

150 cam_stereo_view_matrix(CAM_LEFT);

151 gl_translatef(-pan_x, -pan_y, -1.1 * ring_height * segm);

152

153 render(tsec);

154 } else {

155 glViewport(0, 0, view_xsz, view_ysz);

156 cam_aspect((float)view_xsz / (float)view_ysz);

157

158 gl_matrix_mode(GL_PROJECTION);

159 gl_load_identity();

160 gl_rotatef(-90, 0, 0, 1);

161 cam_proj_matrix();

162

163 gl_matrix_mode(GL_MODELVIEW);

164 gl_load_identity();

165 cam_view_matrix();

166 gl_translatef(-pan_x, -pan_y, -1.1 * ring_height * segm);

167

168 render(tsec);

169 }

170

171 assert(glGetError() == GL_NO_ERROR);

172 }

173

174 static void render(float t)

175 {

176 int i;

177 float text_line;

178

179 draw_tunnel(t);

180

181 if(use_bump) {

182 glDepthMask(0);

183 text_line = floor((text_speed * t) / text_period);

184 for(i=0; i<8; i++) {

185 vec3_t tpos = calc_text_pos(t - (float)i * 0.011);

186 draw_text(text_line, tpos, 1.5 / (float)i);

187 }

188 glDepthMask(1);

189 }

190 }

191

192 static void draw_tunnel(float t)

193 {

194 static const float uoffs[] = {0.0, 0.0, 1.0, 1.0};

195 static const float voffs[] = {0.0, 1.0, 1.0, 0.0};

196 int i, j, k, tang_loc = -1;

197 float du, dv;

198

199 prog = use_bump ? prog_tunnel : prog_simple;

200

201 bind_program(prog);

202 set_uniform_float(prog, "t", t);

203

204 if(use_bump) {

205 vec3_t ltpos = calc_text_pos(t);

206

207 bind_texture(tex_normal, 1);

208 set_uniform_int(prog, "tex_norm", 1);

209 bind_texture(tex_stones, 0);

210 set_uniform_int(prog, "tex", 0);

211

212 set_uniform_float4(prog, "light_pos", ltpos.x, ltpos.y, ltpos.z, 1.0);

213 tang_loc = get_attrib_loc(prog, "attr_tangent");

214 } else {

215 bind_texture(tex, 0);

216 set_uniform_int(prog, "tex", 0);

217 }

218

219 gl_matrix_mode(GL_TEXTURE);

220 gl_load_identity();

221 gl_translatef(0, -fmod(t * tunnel_speed, 1.0), 0);

222

223 gl_begin(GL_QUADS);

224 gl_color3f(1.0, 1.0, 1.0);

225

226 du = 1.0 / sides;

227 dv = 1.0 / segm;

228

229 for(i=0; i<segm; i++) {

230 float trans_zp[2], trans_z0[2], trans_z1[2];

231

232 float zp = ring_height * (i - 1);

233 float z0 = ring_height * i;

234 float z1 = ring_height * (i + 1);

235

236 worm(t, zp, trans_zp, trans_zp + 1);

237 worm(t, z0, trans_z0, trans_z0 + 1);

238 worm(t, z1, trans_z1, trans_z1 + 1);

239

240 for(j=0; j<sides; j++) {

241 for(k=0; k<4; k++) {

242 float u = (j + uoffs[k]) * du;

243 float v = (i + voffs[k]) * dv;

244

245 tunnel_vertex(u, v, du, dv, tang_loc, t);

246 }

247 }

248 }

249 gl_end();

250

251 bind_texture(0, 1);

252 bind_texture(0, 0);

253 }

254

255 static void tunnel_vertex(float u, float v, float du, float dv, int tang_loc, float t)

256 {

257 vec3_t pos, norm;

258 vec3_t dfdu, dfdv, pos_du, pos_dv;

259

260 float theta = 2.0 * M_PI * u;

261 float theta1 = 2.0 * M_PI * (u + du);

262

263 float x = cos(theta);

264 float y = sin(theta);

265 float x1 = cos(theta1);

266 float y1 = sin(theta1);

267 float z = v / dv * ring_height;

268 float z1 = (v + dv) / dv * ring_height;

269

270 float trans_z[2], trans_z1[2];

271

272 worm(t, z, trans_z, trans_z + 1);

273 worm(t, z1, trans_z1, trans_z1 + 1);

274

275 pos = v3_cons(x + trans_z[0], y + trans_z[1], z);

276 pos_du = v3_cons(x1 + trans_z[0], y1 + trans_z[1], z);

277 pos_dv = v3_cons(x + trans_z1[0], y + trans_z1[1], z1);

278

279 dfdu = v3_sub(pos_du, pos);

280 dfdv = v3_sub(pos_dv, pos);

281 norm = v3_cross(dfdv, dfdu);

282

283 gl_vertex_attrib3f(tang_loc, dfdu.x, dfdu.y, dfdu.z);

284 gl_normal3f(norm.x, norm.y, norm.z);

285 gl_texcoord2f(u * 2.0, v * 4.0);

286 gl_vertex3f(pos.x, pos.y, pos.z);

287 }

288

289 static vec3_t calc_text_pos(float sec)

290 {

291 float t = text_speed * sec;

292 float z = fmod(t, text_period);

293 float pan[2];

294

295 worm(sec, z, pan, pan + 1);

296 return v3_cons(pan[0], pan[1], z + ring_height);

297 }

298

299 static void draw_text(float idx, vec3_t tpos, float alpha)

300 {

301 gl_matrix_mode(GL_MODELVIEW);

302 gl_push_matrix();

303 gl_translatef(tpos.x, tpos.y, tpos.z);

304

305 glEnable(GL_BLEND);

306 glBlendFunc(GL_SRC_ALPHA, GL_ONE);

307

308 bind_program(prog_text);

309 set_uniform_float(prog_text, "idx", idx);

310

311 bind_texture(tex_text, 0);

312

313 gl_begin(GL_QUADS);

314 gl_color4f(1.0, 1.0, 1.0, alpha > 1.0 ? 1.0 : alpha);

315

316 gl_texcoord2f(0, 1);

317 gl_vertex3f(-1, -0.2, 0);

318

319 gl_texcoord2f(1, 1);

320 gl_vertex3f(1, -0.2, 0);

321

322 gl_texcoord2f(1, 0);

323 gl_vertex3f(1, 0.2, 0);

324

325 gl_texcoord2f(0, 0);

326 gl_vertex3f(-1, 0.2, 0);

327 gl_end();

328

329 bind_texture(0, 0);

330 glDisable(GL_BLEND);

331

332 gl_pop_matrix();

333 }

334

335

336 static void worm(float t, float z, float *tx, float *ty)

337 {

338 float x, y;

339 x = sin(t) + cos(t + z) + sin(t * 2.0 + z) / 2.0;

340 y = cos(t) + sin(t + z) + cos(t * 2.0 + z) / 2.0;

341

342 *tx = x * 0.5;

343 *ty = y * 0.5;

344 }

345

346

347 void reshape(int x, int y)

348 {

349 glViewport(0, 0, x, y);

350

351 gl_matrix_mode(GL_PROJECTION);

352 gl_load_identity();

353 glu_perspective(40.0, (float)x / (float)y, 0.5, 500.0);

354

355 view_xsz = x;

356 view_ysz = y;

357 }

358

359 static unsigned int get_shader_program(const char *vfile, const char *pfile)

360 {

361 unsigned int prog, vs, ps;

362

363 if(!(vs = get_vertex_shader(find_resource(vfile, 0, 0)))) {

364 return 0;

365 }

366 if(!(ps = get_pixel_shader(find_resource(pfile, 0, 0)))) {

367 return 0;

368 }

369

370 if(!(prog = create_program_link(vs, ps))) {

371 return 0;

372 }

373 return prog;

374 }

375

376

377 #ifdef IPHONE

378 #include <QuartzCore/QuartzCore.h>

379

380 static float get_sec(void)

381 {

382 static float first;

383 static int init;

384

385 if(!init) {

386 init = 1;

387 first = CACurrentMediaTime();

388 return 0.0f;

389 }

390 return CACurrentMediaTime() - first;

391 }

392

393 #else

394

395 static float get_sec(void)

396 {

397 return (float)glutGet(GLUT_ELAPSED_TIME) / 1000.0f;

398 }

399 #endif